Magneto plug



E. L. HADDOCK MAGNET@ PLUG Feb. 16 1926. 1,573,316'

Filed Sept. 13.' 1923 Patented Feb. 16, 1926.

UNITED STATES ERNEST L.' HADDOCK, 0F VANCOUVER, BRITISH COLUMBA, CANADA.

MAGNETO PLUG.

Application filed September 13, 1923.

To all whom if 'may concern:

Be itknown that 1, ERNEST L. Hannoon, a. subject of the King of GreatBritain, residing at Vancouver, in the Province of British Columbia andDominion of Canada, have invented certain new and usefulimproven'ientsin a lvfagneto Plug, of which the following is a specification.

This invention appartains to a terminal` plug for magnetos.

1n a. well known type of automobile, the terminal plug of the magnetobecomes quickly fouled and short eircuited and thus renders the completeignition system out of working` order. Further the plug is so situ atedand so arranged in the magneto housing, that the same is not easilyremoved, and when the same is repeatedly removed the connection betweenthe plug and the magneto housing becomes worn and leaky.

1t is therefore a prime object of this invention to provide an improvedmagneto terminal plug, which is so constructed, that the -same will notbe easily fouled or short ci reuited and which is so associated with themagneto easing, that the plug can be quickly removed when necessarywithout injuring the connection between the plug and the housing.

A still further object of the inveutifni is to provide an improvedmagneto ter iinal plug of the above character, which will be durable andetlicient in use, one that will be simple and easy to manufacture andone which can be placed upon the market at a small cost.

Vith these and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts, as will behereinafter more specilically described, claimed and illustrated in theaccompanying drawins, in which drawings:

FigureV 1 is a side elevation of the improved magneto contact orterminal plug'.

Figure 2 is a vertical longitudinal section through the same.

Figure 3 is a horizontal. section through the plug taken on the line 8-3of Figure Q.

Figure 4 is a horizontal section taken through the plug, on the line4-si of Figure Q.

Referring to the drawings in detail, wherein similar referencecharacters designate corresponding parts throughout the several views,the letter generally indifates the improved vterminal plug, which SerialNo. 662,517.

comprises a jacket 5, preferably formed of steel, iron or the like.reduced at its lower end and provided with external screw threads G forpermitting the same to be threaded into a screw threaded opening 7formed in an attaching plate S. This attaching plate 8 is adapted to beconnected to the magneto casing` of the automobile with which the plug`is associated by suitable screws or the like 9 and it' so desired agasket can be placed between the plate 8 and the magneto casing (notshown), so as to make a tight lit therewith. The upper end of the jacket5 has its outer surface formed of a polygonal configuration. so as topermit. the ready engaging` thereof by a wrench or the like. .At a pointintermediate its ends the jacket 5 provided with au internal shoulder10, for a purpose, which will be hereinafter more fully deseril'ied. hsclearly shown in Figure 2 of the drawing the jacket 5 is adapt-ed toreceive the porcelain or other insulation body 11 and the same isenlarged at a point intermediate its ends to provide upper 'and ilowershoulders, and it can be seen that the lov-,fer shoulder formed by theenlargement 1&2 rests upon the shoulder 10 formed in the jacket Theporcelain body 11 held in place in the jacket 5 by means of a suitablenut or the like 13. rThis nut 13 engages the upper shouider formed bythe enlargement 12 on the porcelain and if so desired suitable gasketscan be placed on the upper and lower shoulders defined by theenlargement, so as to prevent injury to the porcelain incident toscrewing of the nut 13 into place. A contact rod` 15 extends axiallythrough thel porcelain body 11 and terminates below the jacket 5 and theporcelain body 11, as is clearly shown in Figure 2 of the drawings. Theupper end of the contact rod 15 terminates in a binding post 1G and asuitable bindingnut 17 can be provided for holding the magneto terminalwire in place. As clearly shown in Figure 2 of the drawings the. ripperend of the contact post or rod 15 is limited in its downward movement bysuitable nuts and washers 18 which are threaded on the post in contactwith the porcelain body 11. The magneto terminal vire is clamped betweenthe nuts 1T and 18 and these nuts can be adjusted so as to regulate theposition of the contactrod 15 in the porcelain body 11. The lowersurface of the porcelain body 1.1 is provided with an This jacket 5 is'by the nuts 18, as heretobefore stated.

enlarged chamber 19 for the reception of an expansion spring 20, whichis coiled about the contact rod 15. The upper end of this spring 2Oengages the upper end of the chamber, while the lower end of the spring`engages a collar 2l formed on the contact rod. This spring` serves asmeans for normally holding the Contact post down in the plug and thedownward movement is limited The extreme lower end of the rod isprovided with a. substantial conical-shaped contact point 22.

A sliding' porcelain protector body 23 receives the lower end of theContact rod l5 and this body 23 is of a sleeve like config;- uration andhas the upper end of the bore thereof enlarged in diameter so to permitthe same to be snugly fitted between the jacket 5 and the lower end ofthe porcelain body ll. As shown an expansion spring 2lis coiled aboutthe lower end of the porcelain body ll and engages :nshoulder formed inthe jacket y5 at one end and the upper end oi'4 a porcelain prot ctorsleeve 23 at 'its lower end. This spring serves as means for normallyholding; the porcelain body at the lower end of thecontact plug and itcan be seen that the lower end of the protector porcelain body is flaredas at 25 for receivingr the contact peint lt .is obvious that theprotector insulating sleeve 23 will effectively prevent the adhering` offoreign objects to the Contact point 22 and thus prevent shortcircuiting of the plug. It is also obvious that when it is desired toremovev the plug for the replacement of broken parts or for thecleaning` thereof, the same can be readily and quickly unt-hreaded fromthe attachingplate, without disturbing any other parts of the magnetocasing or the like.

Changes in details may be made without departing' from the spirit or thescope of this invention.

That I claim as new is:

A terminal plug for magnetos comprising;r a metal jacket having anannular enlargement therein defining an upper and a lower stop shoulder,a porcelain body fitted in the jacket resting on the shoulder, the lowerend of the porcelain body beingreduced and extended below the annularenlargement in spaced relation to the inner face of the jacket definingan annular chamber therewith, a nut for holding,` the porcelain body inposition in the jacket on said shoulder, an axially disposed contact'rod extending through the porcelain body and terminating below the lowerend thereof, a binding` post on the upper end of the rod, a contactpoint on the lower end of the rod,

inea-ns carried by the upper end of the rod for holding the same inposition on the porcelain body and for limiting` the slidingr iovementthereof, a stop collar on said rod, an expansion spring` coiled aboutthe rod engaging the collar at its lower end and` the porcelain body atits upper end, a porcelain sleeve having` a reduced extension slidablydisposed in the chamber deiined by the jacket and the reduced portion ofthe porcelain body the reduced portion of the sleeve dei'ining,` a stopshoulder, the sleeve receiving,r the lower end of the Contact rod and anexpansion spring disposed in the cl'iamber having its opposite endsengaging the upper edge of the sleeve and the stop shoulder delined bythe annular, enlargement of the jacket.

In testimony whereof I ath); my signature.

ERNEST L. HADD-OCK.

